body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-image: url('../images/cartoes-de-credito-online.png');
    background-size: cover;
}

.container {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    height: 45%;
    max-height: 250px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

input {
    width: 100%;
    max-width: 300px;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

.resultado {
    margin-top: 20px;
    font-size: 18px;
    color: #333;
}

@media only screen and (max-width: 500px) {
    .container {
        max-width: 310px;
        min-height: 260px;
        height: 45%;
        padding: 10px;
    }

    input {
        width: 90%;
        padding: 8px;
        font-size: 14px;
    }

    button {
        padding: 8px 16px;
        font-size: 14px;
    }

    .resultado {
        font-size: 16px;
    }

    .shrink {
        min-height: 55vh;
    }
}